This package of four center alignment guides is compatible with the Stampwheel from Altenew (sold separately). These guides will help align your cardstock with symmetry when stamping images such as wreaths, backgrounds, and more. These guides match the sizes of cardstock commonly used, guide one measures 4.25" x 5.5", guide two measures 6" x 6", guide three measures 5.5" x 5.5", and guide four measures 4.25" x 4.25". After matching your size of cardstock, simply place the guide in one corner of the Stampwheel's sticky mat, make sure that the two outer sides of the guide are directly against the two walls of the Stampwheel platform, then place your cardstock in the inner corner of the guide. Simply remove the guide and you will have a perfectly centered piece of cardstock.